Easy DIY Spawning Mops

When goldfish breed, the male fish drives the female into soft plants so that when the eggs are laid, they get stuck in the plants and they can develop safely.  Rather than using live plants all the time, many breeders simulate plants by making what are called spawning mops.  These are handy because they can be easily removed to a fry grow-out tank when spawning is finished, and they can be sterilized after use, unlike live plants.  This guide will show you a cheap and easy way to make your own spawning mops.

You’ll need some acrylic yarn in any color you’d like.  But just keep in mind two things; first, eggs will be much easier to see on a darker color, and second, some people think that fish breed more readily on green yarn since it looks like real plants.  You’ll also need scissors, tape, some cork bottle stoppers, and a hardcover book.  The book should be almost as tall as the aquarium you’re going to use the mops in.

Step 1
Cut off a length of yarn and lay it horizontally across the book.  Use a couple pieces of tape to hold it in place while you work.

Step 2
Begin winding the yarn vertically around the book.  Go around about 100 times.  You can do fewer or more times depending on how thick you want your mop to be.

Step 3
Move the horizontal piece of yarn up to the top of the book, and use it to tie a knot at the top.

Step 4
Take your scissors and cut the yarn at the bottom of the book.

Step 5
Take a cork, place it in the middle of your mop (where the knot is) and fold the mop in half to completely cover the cork.  Then, while holding the top tight with one hand, tie a length of yarn around it to keep the cork held securely in place.

Step 6
Boil some water in a large pot.  Once it has reached a rolling boil, remove the pot from heat and soak your spawning mop in the hot water for about 15 minutes.  Do not leave the pot on the heat while the spawning mop is soaking, because the boiling water will tangle the threads of the mop and it will be difficult to fix.  I found this out the hard way.  :/  After it has soaked, rinse it off in cool water, and it’s ready to use!

Even my cat, Sami, approves!

 If you prefer a video demonstration, feel free to check out the video version of this guide as well!

Dia de los Muertos Goldfish Tank
I thought my goldfish should join in on the holiday fun! Dia de los Muertos (Day of the Dead) is
Read more.
Beginner Mistakes to Avoid | Dos and Don’ts
Do plenty of research before buying anyfish!  This will help you avoid many beginner mistakes and allow you toprovide a
Read more.
What Pet Stores Don’t Tell You About… Cycling
Now I don’t want to make it sound like all pet stores give bad information about fishkeeping, because some are
Read more.
Yujin Goldfish Gashapon Collection
Several months ago I discovered these goldfish gashapons and began collecting them!  Gashapons are Japanese capsule toys dispensed from coin
Read more.
Update on Luca, Felix, and Clover
My new ghost bristols have been getting all the attention lately, so I thought I’d take some time to do
Read more.
Callisto is Declining
Callisto came to live with me on November 10th, 2011.  From day one, she has always been a major surface-gulper. 
Read more.
How To Euthanize a Fish Humanely
Euthanizing our pet fish is obviously something none of us ever want to have to do, but sometimes it’s the
Read more.
Goldfish Growth and Changes Update
Here’s the most recent update: Butterfly Telescope Growth and Changes Today Luca weighs 47 grams, is 2.75″ in body length,
Read more.
Rest in Peace Callisto
Callisto was euthanized last weekend because of her ongoing and worsening health condition.  It was a tough decision to make,
Read more.
New Culling Nets
For my first spawn of ghost bristol fry, I’ve been making do with a regular aquarium net; the dark green
Read more.

One thought on “Easy DIY Spawning Mops

  1. Lisa

    Hi Jennie ^__^ love this, brilliant idea.

    Quick question I was wondering if you could help me? I have 3 males with 1 female as I recently discovered! (Lots of breeding activity) Poor Voodoo was absolutely exhausted/hiding from the boys by the time I got to separate her! Voodoo is now in a tank on her lonesome as the rest of the fish I have are ALL male (what are the chances? lol)

    I’m worried Voodoo isn’t liking being alone but also not liking the 3 boys chasing her… any suggestions?

    I’m about to do a post on my blog about it all if you want more info.

    Thank you for your time ๐Ÿ™‚

  2. Troy

    So I boiled them and the water left in the pot had a slight green color.Should I be concerned and not add these to my tank?I used 100% acrylic yarn.


Leave a Reply

Your email address will not be published. Required fields are marked *